Twin aeroplane-propeller



P. PETRES.

TWIN AEROPLANE PROPELLEB.

APPLICATION FILEDIJUNE 10, 1920.

Patented Jan. 4, 1921.

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2 SHEETS INVENTOR Paul Pe/res ATTORNEY with said auxiliary propeller blades.

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PAUL PETBES, OF/LONG ISLAND CITY, NEW

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To all whomitmay concern:

Be it known that 1, PAUL Pn'rnus, citizen ofHungary, residing at Long Island City, in the county of Queens and State of New York, have invented certain new and useful Improvements in Twin Aeroplane-Propellers, of which the following is a specification.

This invention relates to aeroplanes and especially to the propelling mechanism thereof.

In the operation of an aeroplane propeller, which is usually placed at the front part of the machine, there is a certain amount of slippage whereby the linear distance traveled by the propeller in one revolution thereof is not equal to the lead or pitch of the Due to this slippage, a strong current of air is set up behind the propeller, the power necessary to produce said current having heretofore been wasted.

As one of the objects of this invention, I

provide an auxiliary propeller behind the driving propeller for the purpose of obtainpower fromthe air current mentioned. A further object of this invention is to provide a power plant capable of rotation propeller in a direction opposite to that of the main driving proeller.

Other objects of the invention will appear from the description which follows, refer-- ence being had to the accompanying drawings, in Which, C

Figure 1 is a front view of my invention wherein a shown as. the power generator.

Fig. 2 is a bottom view and partial sec- 1 tion of the same.

Fig. 3 is an enlarged horizontalsection on line 3-3 of Fig. 2.

Fig. 4 is a vertical-section on line 4-4. of

Fi 3 and z Figff) i motor 10, so

s a perspective view of-an aeroplane to which my invention has been applied for driving and for vertically lifting said aeroplane.

In the practical embodiment of my invention, a motor 10 of any suitable type is suitably secured to an auxiliary propeller 11, as by braces 12 secured to the hub 13 of propeller 11 and to crank case 14. of that rotation of propeller 11 carries the entire motor 10 around with it. The sizeof said propeller is such that it produces an apprecia le amount of power small unit pressure three cylinder gasolene engine is Specification of Letters Patent. Pate t d J 4 192 Application filed June 10,

1920. Serial m5. 387,816.

on the blades thereof, the pitch of said blades and the direction of the rotation thereof being opposite to that of the main dr1v1ng propeller 15, which is suitably mounted for rotationby motor 10. The support for auxiliary propeller 11 comprises the hollow shaft 16'mounted for rotation on the stationar inner hollow shaft 17, suitable ball bearings 18 being provided between the rotatable shaft 16 and the frame 19, inwhich said shafts are mounted, said propellers 11 and 15 and shafts 16 and 17 being coaxially arranged. Shaft 17 is connected to a source of fuel supply, a suitable packing 20 serving to prevent the fuel from leaking atthe :joint' lene driven motor, I do not wish to limit myself to this type of engine, principle here involved can be utilized for power economy even wheni other types of engines, such gines having any number of cylinders or other types of engines adapted for driving aeroplanes, are used, by being rotated together with an auxiliary propeller.

The frame 19 may be part oftheaeroplane framing or it may be the front part of the fuel tank, the only re uirement there for being that it be maileof sufficient strength to support the motor 10, the propeller 11 and the arts carried thereby.

It will be seen that, since the motor 10 is rotatable with respect to frame 19, a rotary arrangement for istributing the current to the various cylinder s ark plugs is desirable, when an internal com To the ac'complishmentof this end, I attach the ring disk 24 to frame 19 by bolt 25 and a nut 26 on the end of said pin, a second nut 27 serving to hold one wire 28 carrying electrical current from a source not shown. fSuitalole insulation 29 from passing through rame 19. 'For conducting the current from .disk 24 to the distributer, a metallic spring 30 is pressedin contact with disk 24 by hub 13 of propeller .11,

distributer mechanism 1g. 4:). While said a wire as 31 leading from a terminal on said spring 30 to binding post end 32 of the F or 10. c

While I illustrate a three cylinder gaso- I since the broad as gasolene or 011 driven en- 7 turn is secured to a metallic plate 34 suitably insulated from crank shaft 35 by insulation 36, a return wire 37, held between said post end 32 and said post 33, leading to the spark plug 38 of one of the motor cylinders. The screw 39 passing through post end 32 conducts the current from wire 31 to the flat sprin 40, which is in constant contact with the fistrlbuting cylinder 41 mounted on crank shaft 35 and suitably insulated there from as by insulation 42, whereby current 1s constantly passed through said distributlng cylinder.

As many binding posts 46 as may be necessary are attached to plate 34, each'post 46 carrying a Wire 43 for conducting current to one of thespark plugs of the motor, each of said posts 46 carrying also a fiat spring 44 which is always in contact with the lower portion of the distributing c linder 41, the majorpart of which is ma e of insulating material as 45.- A projecting metallic part 47, on said distributing cyllnder 41 at a point horizontally opposed to flat springs 44 serves to distribute current to the pro er one of wires 43 or wire 37 whenever sai projection 47 comes in contact 'with an of springs 44 on the rotation of crank sha t 45, the mechanism being properly synchronized to operate effectively.

.In the operation, as will be apparent, the motor 10 and propeller 11 will rotatein one direction, and the propeller 15 in an opposite direction. By ma ing the propeller 11 of considerably greater size than the propeller 15 the increased resistance to the air will cause the propeller 11 to rotate relatively slowly while at the same time it will be assisted in its rotation by the air current from the front propeller 15. As shaft 16 rotates about shaft 17 'it receives fuel thereb from, which fuel is conducted through pipes 23 to the cylinders.

Spring 30'rotates on disk 34 receiving current therefrom and conducting the cursupplying electric current wires 43 to the spark plugs 38. Plate 34 r0 tates with the motor, while distributer cylind er 41 rotates with the crank shaft, Where by the relative rotation is increased on the rotation of the motor 10 with propeller 11, and the proper timing is retained.

What I claim is: v

1. In an aeroplane power plant, a propeller, a motor for driving said propeller arranged for rotation in -a direction opposite to that of said propeller, andmeans for to said motor, including a stationary disk connected to a source of electrical current, a spring rotatable with the motor and in contact with said disk, a rotatable distributing cylinder fixed upon and insulated from the motor shaft, means electrically connecting said spring and said cylinder, and means for conducting current from said cylinder to the.

spark plugs of said motor.

2. In an aeroplane'power plant, a propeller, a motor for driving said propeller and arran ed for rotation in a direction opposite to t at of said propeller, and means for supplying electric current to said motor, including a stationary disk connected to a source of electrical current, a plate fixed to and insulated from the crank case of the motor, a distributin cylinder fixed upon and insulated from t e shaft of the motor, said distributing cylinder having one end thereof presenting a metallic surface completely therearound and a second portion presenting an insulating surface having a metallic projection at one point, and binding posts upon the said plate having memers engaging the .said cylinder.

In testimony whereof I have aflixed my signature this 5th day of June, 1920.

PAUL PETRES. 

